ok makes sense - sorry don't know anything that can do this elegantly - I'd probably go for either the vpme.de pwr & a 1hp gap (not big enough really for other things to fall through) to thread the ribbon through or a separate power supply with a wall wart, or a separate case (a 4ms pod maybe) or try to find a replacement for the 112 would be my suggestions...
another option might be to find a builder who will build you the switch - you'd only need to be able to switch the +/-ve 12v - so doable on a single dptd toggle switch - ignore the 5v and hardwire the ground... parts are under 10GBP/EUR/USD including a panel (the switch and the panel being by far the most expensive parts) - no need for a pcb - a bit of perfboard would do it... probably someone would build you one for 20 or so... maybe try modwiggler music tech subforum (there's a list of builders in the stickies - you might find one locally) or on r/synthdiy here
tbh the hardest part is the drilling of the panel for the hole to mount the switch!
Utility modules are the inexpensive, dull polish that makes the expensive, shiny modules actually shine!!!
sound sources < sound modifiers < modulation sources < utilities